Headset



FIG. 1 is a reduced scaled perspective view of a headset, with attached devices shown in dashed lines and not claimed;

FIG. 2 is an upper right front perspective view;

FIG. 3 is a left side elevational view;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view. 

The ornamental design for a headset, as shown and described. 